Quasi-Floating Counterbore Tool for Fascia Trim Depth Accuracy
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Solution Overview
Problem
Existing counterbore tools often damage or mar composite material fascia trim surfaces during the drilling process and fail to set fasteners at the proper depth accurately, lacking precision and reliability.
Innovation Solution
A counterbore tool comprising a working piece with a cutting section formed from a single sheet of metal, featuring machined cutting edges at specific angles, a retainer, and a collar with a quasi-floating configuration to minimize surface contact and ensure precise drilling and counterbore formation without damaging the fascia trim.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional counterbore tools are used to drill fascia trim, then drilling function is achieved, but the fascia trim surface is marred or damaged
Solution Approach 1:
A collar component is introduced as an intermediary between the drill bit and the fascia trim surface. The collar includes a bearing surface that contacts and supports the fascia trim during drilling, preventing direct contact between the drill bit and the trim surface, thereby eliminating marring or damage while enabling the drilling function to proceed
Solution Approach 2:
The collar is positioned beforehand to provide a protective bearing surface that cushions and supports the fascia trim before the cutting section makes contact. This pre-positioned protective element prevents surface damage by absorbing and distributing the mechanical contact forces during the drilling operation
2Ease of manufacture
If conventional tools are used for counterbore formation, then counterbore is created, but fastener depth control is inaccurate
Solution Approach 1:
The collar replaces complex mechanical depth control mechanisms with a simpler bearing surface system. The collar's bearing surface provides a stable reference plane that enables accurate depth control through the engagement of the cutting section with the collar, eliminating the need for elaborate mechanical stops or adjustment mechanisms while achieving precise fastener depth
Solution Approach 2:
The collar introduces new geometric parameters (bearing surface position, collar height, engagement dimensions) that directly control the counterbore depth and fastener setting depth. By adjusting these geometric parameters of the collar, precise depth control is achieved without complex mechanical systems
3Ease of manufacture
If a simple drill bit is used, then cost is reduced, but drilling precision and reliability are insufficient
Solution Approach 1:
The tool is segmented into distinct functional components: a simple working piece for cutting, a retainer for mounting, and a collar for support and depth control. This segmentation allows each component to be optimized independently - the working piece can be a simple, low-cost drill bit while the collar provides the precision and reliability functions, achieving both cost reduction and improved performance
Data Source
AI summary
A drilling tool has a working piece retained by a retainer mounted to a collar. The working piece includes a distal shank and a cutting section and is rotationally fixed relative to the retainer. The retainer may include an engagement protrusion positioned outward of the shank with the protrusion engaging an inner surface of the collar or the collar may include an engagement protrusion with the protrusion engaging an inner surface of the retainer to create a quasi-floating relationship between the retainer and collar. The cutting section may have a distal primary bore cutting sub-section and a proximal counterbore cutting sub-section. The collar includes a lower surface for abutment against a building member during drilling operation to halt axial movement of the tool.